Centrifugal heat dissipation device and motor using same

ABSTRACT

A centrifugal heat dissipation device and a motor using same are disclosed. The centrifugal heat dissipation device includes a main body having a shaft hole, a heat-absorption zone and a heat-transfer zone. The heat-transfer zone has a radially outer side connected to the heat-absorption zone and a radially inner side connected to the shaft hole. The shaft hole axially extends through the main body for receiving a shaft of a motor therein. A centrifugal force generated by the rotating shaft and accordingly, the heat dissipation device enables enhanced vapor-liquid circulation of a working fluid in the heat dissipation device, so that heat generated by the operating motor is absorbed by the centrifugal heat dissipation device and transferred to the shaft for guiding out of the motor, allowing the motor to have largely upgraded heat dissipation performance.

This application claims the priority benefit of Taiwan patentapplication number 100110737 filed on Mar. 29, 2011.

FIELD OF THE INVENTION

The present invention relates to a centrifugal heat dissipation device,and more particularly to a centrifugal heat dissipation device thatrotates and utilizes a produced centrifugal force to enable enhancedvapor-liquid circulation of a working fluid filled therein. The presentinvention also relates to a motor that uses the above-describedcentrifugal heat dissipation device and therefore has largely upgradedheat dissipation performance.

BACKGROUND OF THE INVENTION

All the currently available motors, power generators, and various kindsof electric engines include a rotor and a stator. When a motor isexcited due to the effect of stator-rotor mutual induction, the motorworks or generates power. Heat will be generated when the silicon steelsheets provided on the rotor and the winding coils wound on the siliconsteel sheets are supplied with an electric current. The hysteresis loss(iron loss) and copper loss of the rotor would generate thermal power,which causes increased temperature and lowered efficiency of the motorrotor, and thereby limits the maximum power of the rotary motor.

A motor usually has an efficiency of 85%. The 15% loss of the motorwould cause heat transfer among the motor windings, the motor statorand/or the motor housing. When operating under atmospheric pressure, theheat generated by the motor rotor is transferred to the motor housingmainly via convection. That is, the heat generated by the motor rotor istransferred to the motor housing with the air inside the motor as theheat transfer medium. By providing the motor rotor with radiating finsto cool the motor, the effect of heat transfer via convection can bemaximized.

It is also possible to transfer part of the thermal loss power of themotor or the power generator to an external environment through heatconduction and radiation via the rotary shaft and bearings of the motoror the power generator. However, this type of heat transfer mechanismcan only provide relatively small cooling effect. When a high-speedshaft and a thermal rotor operate in a high-temperature condition, therotor must be cooled. Otherwise, the rotor rotating at high load issubject to burnout due to the thermal power generated by the hysteresisloss (iron loss) and copper loss.

The currently cooling systems available for motors and power generatorsare mainly designed to carry heat away from the stator. As to the rotor,it could not be effectively cooled since there has not been anyeffective heat dissipation means for rotor up to date.

In brief, the prior art motors or power generators have the followingdisadvantages: (1) the hysteresis loss and copper loss of the rotorthereof generates thermal power to result in increased rotor temperatureand limited motor power; (2) heat tends to accumulate in the rotor; and(3) the rotor has low cooling performance.

SUMMARY OF THE INVENTION

A primary object of the present invention is to provide a centrifugalheat dissipation device that utilizes a centrifugal force to enableenhanced vapor-liquid circulation of a working fluid filled therein, soas to provide increased heat dissipation effect.

Another object of the present invention is to provide a motor withcentrifugal heat dissipation device.

To achieve the above and other objects, the centrifugal heat dissipationdevice according to the present invention includes a main body having ashaft hole, a heat-absorption zone, and a heat-transfer zone. Theheat-transfer zone has a radially inner side connected to the shaft holeand a radially outer side connected to the heat-absorption zone; and theshaft hole axially extends through the main body.

To achieve the above and other objects, the motor with centrifugal heatdissipation device according to an embodiment of the present inventionincludes at least one shaft, a centrifugal heat dissipation device, aplurality of silicon steel sheets, and a housing. The shaft internallydefines a hollow space, and has a first end and an opposite second endcommunicating with the hollow space. The centrifugal heat dissipationdevice includes a main body having a shaft hole, a heat-absorption zone,and a heat-transfer zone. The heat-transfer zone has a radially innerside connected to the shaft hole and a radially outer side connected tothe heat-absorption zone; and the shaft hole axially extends through themain body for receiving the shaft therein. The silicon steel sheets areexternally fitted around the main body of the centrifugal heatdissipation device. The housing is internally provided with a magneticmember, which is located corresponding to but spaced from the siliconsteel sheets when the centrifugal heat dissipation device and the shaftare mounted in the housing. The housing has at least one end being anopen end, to which a cap is connected to close the housing.

To achieve the above and other objects, the motor with centrifugal heatdissipation device according to another embodiment of the presentinvention includes at least one shaft, a centrifugal heat dissipationdevice, at least one magnetic member, and a housing. The shaftinternally defines a hollow space, and has a first end and an oppositesecond end communicating with the hollow space. The centrifugal heatdissipation device includes a main body having a shaft hole, aheat-absorption zone, and a heat-transfer zone. The heat-transfer zonehas a radially inner side connected to the shaft hole and a radiallyouter side connected to the heat-absorption zone; and the shaft holeaxially extends through the main body for receiving the shaft therein.The magnetic member is externally fitted around the main body of thecentrifugal heat dissipation device. The housing is internally providedwith a plurality of silicon steel sheets, which are locatedcorresponding to but spaced from the magnetic member when thecentrifugal heat dissipation device and the shaft are mounted in thehousing. The housing has at least one end being an open end, to which acap is connected to close the housing.

When the centrifugal heat dissipation device rotates along with theshaft of the motor, a centrifugal force is produced. The centrifugalforce enables enhanced vapor-liquid circulation of a working fluidfilled in the heat-absorption zone of the main body of the centrifugalheat dissipation device, so that heat generated by the operating motoris absorbed by the centrifugal heat dissipation device and transferredto the shaft for guiding out of the motor, allowing the motor to havelargely upgraded heat dissipation performance.

BRIEF DESCRIPTION OF THE DRAWINGS

The structure and the technical means adopted by the present inventionto achieve the above and other objects can be best understood byreferring to the following detailed description of the preferredembodiments and the accompanying drawings, wherein

FIG. 1 is a perspective view of a first embodiment of a centrifugal heatdissipation device according to the present invention;

FIG. 2 is a cross sectional view of FIG. 1;

FIG. 3 a is a cross sectional view of a second embodiment of thecentrifugal heat dissipation device according to the present invention;

FIG. 3 b is a cross sectional view of a variant of the second embodimentof the centrifugal heat dissipation device according to the presentinvention;

FIG. 4 is a cross sectional view of a third embodiment of thecentrifugal heat dissipation device according to the present invention;

FIG. 5 is a perspective view of a fourth embodiment of the centrifugalheat dissipation device according to the present invention;

FIG. 6 is an exploded perspective view of a first embodiment of a motorwith centrifugal heat dissipation device according to the presentinvention;

FIG. 7 is an assembled view of FIG. 6;

FIG. 8 is an assembled longitudinal sectional view of the motor of FIG.6;

FIG. 9 is an exploded perspective view of a second embodiment of themotor with centrifugal heat dissipation device according to the presentinvention without showing the housing thereof;

FIG. 10 is an assembled perspective view of a third embodiment of themotor with centrifugal heat dissipation device according to the presentinvention without showing the housing thereof;

FIG. 11 is an assembled longitudinal sectional view of a fourthembodiment of the motor with centrifugal heat dissipation deviceaccording to the present invention;

FIG. 12 is an assembled longitudinal sectional view of a fifthembodiment of the motor with centrifugal heat dissipation deviceaccording to the present invention;

FIG. 13 is an assembled longitudinal sectional view of a sixthembodiment of the motor with centrifugal heat dissipation deviceaccording to the present invention;

FIG. 14 is an exploded perspective view of a seventh embodiment of themotor with centrifugal heat dissipation device according to the presentinvention;

FIG. 15 is an assembled view of FIG. 14;

FIG. 16 is an assembled longitudinal sectional view of the seventhembodiment of the motor with centrifugal heat dissipation deviceaccording to the present invention;

FIG. 17 is an assembled perspective view of an eighth embodiment of themotor with centrifugal heat dissipation device according to the presentinvention without showing the housing thereof;

FIG. 18 is an assembled perspective view of a ninth embodiment of themotor with centrifugal heat dissipation device according to the presentinvention without showing the housing thereof;

FIG. 19 is an assembled longitudinal sectional view of a tenthembodiment of the motor with centrifugal heat dissipation deviceaccording to the present invention;

FIG. 20 is an assembled longitudinal sectional view of an eleventhembodiment of the motor with centrifugal heat dissipation deviceaccording to the present invention; and

FIG. 21 is an assembled longitudinal sectional view of a twelfthembodiment of the motor with centrifugal heat dissipation deviceaccording to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will now be described with some preferredembodiments thereof and with reference to the accompanying drawings. Forthe purpose of easy to understand, elements that are the same in thepreferred embodiments are denoted by the same reference numerals.

Please refer to FIGS. 1 and 2 that are assembled perspective view andcross sectional view, respectively, of a first embodiment of acentrifugal heat dissipation device 1 a according to the presentinvention. As shown, the centrifugal heat dissipation device 1 a in thefirst embodiment includes a cylindrical main body 1 having a shaft hole11, a heat-absorption zone 12, and a heat-transfer zone 13. Theheat-transfer zone 13 has a radially outer side connected to theheat-absorption zone 12 and a radially inner side connected to the shafthole 11. The shaft hole 11 axially extends through the main body 1.

The heat-absorption zone 12 is internally provided with a working fluid2.

Please refer to FIG. 3 a that is a cross sectional view of a secondembodiment of the centrifugal heat dissipation device 1 a according tothe present invention, and to FIG. 3 b that is a cross sectional view ofa variant of the second embodiment of the centrifugal heat dissipationdevice 1 a. As can be seen from FIGS. 3 a and 3 b, the centrifugal heatdissipation device 1 a in the second embodiment and the variant thereofare generally structurally similar to the first embodiment, except for awick structure 125 that is further provided in the heat-absorption zone12. The wick structure 125 may be a sintered powder structure as shownin FIG. 3 a, or a net-like structure as shown in FIG. 3 b, or include aplurality of continuous or discontinuous grooves (not shown), or be anycombination of the previous structures.

FIG. 4 is a cross sectional view of a third embodiment of thecentrifugal heat dissipation device according to the present invention.As shown, the third embodiment is generally structurally similar to thefirst embodiment, except for a plurality of recesses 126 formed in theheat-absorption zone 12.

FIG. 5 is a perspective view of a fourth embodiment of the centrifugalheat dissipation device according to the present invention. The fourthembodiment is generally structurally similar to the first embodiment,except that the heat-absorption zone 12 is radially outward extendedfrom only a partial axial length of the heat-transfer zone 13 and has afirst transverse surface 12 a and an opposite second transverse surface12 b.

The present invention also relates to a motor 9 with centrifugal heatdissipation device. Please refer to FIGS. 6, 7 and 8, in which a firstembodiment of the motor 9 with centrifugal heat dissipation deviceaccording to the present invention is shown. As shown, the motor 9 inthe first embodiment thereof includes at least one shaft 3, acentrifugal heat dissipation device 1 a, a plurality of silicon steelsheets 4, and a housing 5.

The shaft 3 internally defines a hollow space 31 and has a first end 32and an opposite second end 33. The first and the second end 32, 33 arecommunicable with the hollow space 31.

The centrifugal heat dissipation device 1 a includes a cylindrical mainbody 1, which includes a shaft hole 11, a heat-absorption zone 12, and aheat-transfer zone 13. The heat-transfer zone 13 has a radially innerside connected to the shaft hole 11 and a radially outer side connectedto the heat-absorption zone 12. The shaft hole 11 axially extendsthrough the main body 1, and the shaft 3 is fitted in the shaft hole 11.

The silicon steel sheets 4 are externally fitted around the main body 1of the centrifugal heat dissipation device 1 a.

The housing 5 is internally provided with a magnetic member 51, which islocated corresponding to but spaced from the silicon steel sheets 4 whenthe centrifugal heat dissipation device 1 a and the shaft 3 are mountedin the housing 5. The housing 5 has at least one end being an open end,to which a cap 52 is connected to close the housing 5. In a preferredembodiment, the magnetic member 51 is a magnet.

A cooling fluid 6 is filled in the hollow space 31 of the shaft 3. Thecooling fluid 6 may be air, oil, or water.

The silicon steel sheets 4 have a plurality of winding coils 41externally wound thereon.

Please refer to FIG. 9 that is an exploded perspective view of a secondembodiment of the motor according to the present invention withoutshowing the housing thereof. As shown, the motor in the secondembodiment is generally structurally similar to the first embodiment,except that the centrifugal heat dissipation device for the secondembodiment has a heat-absorption zone 12 that is radially outwardextended from only a partial axial length of the heat-transfer zone 13and has a first transverse surface 12 a and an opposite secondtransverse surface 12 b, and the silicon steel sheets 4 are in contactwith the first or the second transverse surface 12 a, 12 b of theheat-absorption zone 12 of the centrifugal heat dissipation device.

FIG. 10 is an assembled perspective view of a third embodiment of themotor according to the present invention without showing the housingthereof. As shown, the motor in the third embodiment is generallystructurally similar to the second embodiment, except for a first rotaryoil seal 71 and a second rotary oil seal 72 that are further mountedaround the first and the second end 32, 33 of the shaft 3, respectively.

Please refer to FIG. 11 that is an assembled longitudinal sectional viewof a fourth embodiment of the motor according to the present invention.As shown, the motor in the fourth embodiment is generally structurallysimilar to the third embodiment, except for a pressure device 10 that isfurther connected to the shaft 3. The pressure device 10 is a pumpformed of a pressure unit 101, a first pipe 102, and a second pipe 103.The pressure unit 101 has an outlet 1011 and an inlet 1012, which areconnected to the two ends of the shaft 3 via the first pipe 102 and thesecond pipe 103, respectively.

Please refer to FIG. 12 that is an assembled longitudinal sectional viewof a fifth embodiment of the motor according to the present invention.As shown, the motor in the fifth embodiment is generally structurallysimilar to the third embodiment, except for a pressure device 10 that isfurther mounted to the hollow space 31 of the shaft 3. The pressuredevice 10 is a turbine blade assembly being able to guide a coolingfluid 6 (i.e. ambient air) into the hollow space 31 when the shaft 3 isrotating, so as to remove heat from the rotating shaft 3 to achieve thepurpose of cooling the motor.

FIG. 13 is an assembled longitudinal sectional view of a sixthembodiment of the motor according to the present invention. As shown,the motor in the sixth embodiment is generally structurally similar tothe second embodiment, except for a pressure device 10 that is furtherconnected to one end of the shaft 3. The pressure device 10 is a fanbeing able to guide a cooling fluid 6 (i.e. ambient air) into the hollowspace 31 of the shaft 3 when the shaft 3 is rotating, so as to removeheat from the rotating shaft 3 to achieve the purpose of cooling themotor.

Please refer to FIGS. 14, 15 and 16, which are respectively an explodedperspective view, an assembled perspective views, and an assembledlongitudinal sectional view of a seventh embodiment of the motor 9 withcentrifugal heat dissipation device according to the present invention.As shown, the motor 9 with centrifugal heat dissipation device in theseventh embodiment thereof includes at least one shaft 3, a centrifugalheat dissipation device 1 a, at least one magnetic member 51, and ahousing 5.

The shaft 3 internally defines a hollow space 31, and has a first end 32and a second end 33. The first and second ends 32, 33 are communicablewith the hollow space 31.

The centrifugal heat dissipation device 1 a includes a main body 1,which has a shaft hole 11, a heat-absorption zone 12, and aheat-transfer zone 13 as that shown in FIG. 1. The heat-transfer zone 13has a radially inner side connected to the shaft hole 11 and a radiallyouter side connected to the heat-absorption zone 12. The shaft hole 11axially extends through the main body 1, and the shaft 3 is fitted inthe shaft hole 11.

The magnetic member 51 is externally fitted around the main body 1 ofthe centrifugal heat dissipation device 1 a.

The housing 5 is internally provided with a plurality of silicon steelsheets 4, which are located corresponding to but spaced from themagnetic member 51 when the centrifugal heat dissipation device 1 a andthe shaft 3 are mounted in the housing 5. The housing 5 has at least oneend being an open end, to which a cap 52 is connected to close thehousing 5. In a preferred embodiment, the magnetic member 51 is amagnet.

A cooling fluid 6 is filled in the hollow space 31 of the shaft 3. Thecooling fluid 6 may be air, oil, or water.

The silicon steel sheets 4 have a plurality of winding coils 41externally wound thereon.

FIG. 17 is an assembled perspective view of an eighth embodiment of themotor according to the present invention without showing the housingthereof. As shown, the motor in the eighth embodiment is generallystructurally similar to the seventh embodiment, except that thecentrifugal heat dissipation device for the eighth embodiment has aheat-absorption zone 12 that is radially outward extended from only apartial axial length of the heat-transfer zone 13 and has a firsttransverse surface 12 a and an opposite second transverse surface 12 b,and the magnetic member 51 is in contact with the first or the secondtransverse surface 12 a, 12 b of the heat-absorption zone 12.

FIG. 18 is an assembled perspective view of a ninth embodiment of themotor according to the present invention without showing the housingthereof. As shown, the motor in the ninth embodiment is generallystructurally similar to the eighth embodiment, except for a first rotaryoil seal 71 and a second rotary oil seal 72 that are further mountedaround the first and the second end 32, 33 of the shaft 3, respectively.

Please refer to FIG. 19 that is an assembled longitudinal sectional viewof a tenth embodiment of the motor according to the present invention.As shown, the motor in the tenth embodiment is generally structurallysimilar to the ninth embodiment, except for a pressure device 10 that isfurther connected to the shaft 3. The pressure device 10 is a pumpformed of a pressure unit 101, a first pipe 102, and a second pipe 103.The pressure unit 101 has an outlet 1011 and an inlet 1012, which areconnected to the two ends of the shaft 3 via the first pipe 102 and thesecond pipe 103, respectively.

Please refer to FIG. 20 that is an assembled longitudinal sectional viewof an eleventh embodiment of the motor according to the presentinvention. As shown, the motor in the eleventh embodiment is generallystructurally similar to the seventh embodiment, except for a pressuredevice 10 that is further mounted to the hollow space 31 of the shaft 3.The pressure device 10 is a turbine blade assembly being able to guide acooling fluid 6 (i.e. ambient air) into the hollow space 31 when theshaft 3 is rotating, so as to remove heat from the rotating shaft 3 toachieve the purpose of cooling the motor.

FIG. 21 is an assembled longitudinal sectional view of a twelfthembodiment of the motor according to the present invention. As shown,the motor in the twelfth embodiment is generally structurally similar tothe ninth embodiment, except for a pressure device 10 that is furtherconnected to one end of the shaft 3. The pressure device 10 is a fanbeing able to forcedly guide a cooling fluid 6 (i.e. ambient air) intothe hollow space 31 of the shaft 3 when the shaft 3 is rotating, so asto remove heat from the rotating shaft 3 to achieve the purpose ofcooling the motor.

In the previous eighth to twelfth embodiments, the cooling fluid 6filled in the hollow space 31 of the shaft 3 may also be air, oil, arefrigerant, or water.

Please refer to FIGS. 1 to 21. According to the embodiments of thepresent invention, the centrifugal heat dissipation device 1 a is athermosiphon plate. The centrifugal heat dissipation device 1 a isinternally in a vacuum low-pressure state and filled with a workingfluid 2. The working fluid 2 absorbs the heat transferred to thecentrifugal heat dissipation device 1 a, so that the working fluid 2 inthe centrifugal heat dissipation device 1 a is vaporized or boiled. Inother words, the working fluid 2 absorbs sufficient latent heat ofevaporation and is transformed into a vapor-phase working fluid 21. Thevapor-phase working fluid 21 is subject to a lower radially outwardcentrifugal force compared to a liquid-phase working fluid 22. Thecentrifugal force would guide the vapor-phase working fluid 21 toward arotating center, i.e. toward a center of the shaft 3, while guiding theliquid-phase working fluid 22 toward the radially outer side of theheat-absorption zone 12 to thereby achieve a vapor-liquid separatingfunction. Therefore, the centrifugal heat dissipation device 1 aprovides better heat transfer efficiency than conventional heat pipesand vapor chambers that guide the working fluid only via the force ofgravity.

The present invention has been described with some preferred embodimentsthereof and it is understood that many changes and modifications in thedescribed embodiments can be carried out without departing from thescope and the spirit of the invention that is intended to be limitedonly by the appended claims.

1. A centrifugal heat dissipation device, comprising a main body havinga shaft hole, a heat-absorption zone, and a heat-transfer zone; theheat-transfer zone having a radially outer side connected to theheat-absorption zone and a radially inner side connected to the shafthole; and the shaft hole axially extending through the main body.
 2. Thecentrifugal heat dissipation device as claimed in claim 1, wherein theheat-absorption zone is internally provided with a wick structure, andthe wick structure being selected from the group consisting of asintered powder structure and a net-like structure.
 3. The centrifugalheat dissipation device as claimed in claim 1, wherein theheat-absorption zone is provided with a plurality of recesses.
 4. Thecentrifugal heat dissipation device as claimed in claim 1, wherein theheat-absorption zone is radially outward extended from only a partialaxial length of the heat-transfer zone, and defines a first transversesurface and an opposite second transverse surface.
 5. A motor withcentrifugal heat dissipation device, comprising: at least one shaftinternally defining a hollow space and having a first end and anopposite second end; and the first and second ends being communicablewith the hollow space; a centrifugal heat dissipation device including amain body having a shaft hole, a heat-absorption zone, and aheat-transfer zone; the heat-transfer zone having a radially outer sideconnected to the heat-absorption zone and a radially inner sideconnected to the shaft hole; the shaft hole axially extending throughthe main body, and the shaft being fitted in the shaft hole; a pluralityof silicon steel sheets being externally fitted around the main body ofthe centrifugal heat dissipation device; and a housing being internallyprovided with a magnetic member, which is located corresponding to butspaced from the silicon steel sheets when the centrifugal heatdissipation device and the shaft are mounted in the housing; and thehousing having at least one end being an open end, to which a cap isconnected to close the housing.
 6. The motor with centrifugal heatdissipation device as claimed in claim 5, wherein the first and thesecond end of the shaft are connected to a first and a second rotary oilseal, respectively.
 7. The motor with centrifugal heat dissipationdevice as claimed in claim 5, wherein the hollow space of the shaft isfilled with a cooling fluid, and the cooling fluid being selected fromthe group consisting of air, oil, and water.
 8. The motor withcentrifugal heat dissipation device as claimed in claim 5, wherein thesilicon steel sheets have a plurality of winding coils externally woundthereon.
 9. The motor with centrifugal heat dissipation device asclaimed in claim 5, wherein the magnetic member is a magnet.
 10. Themotor with centrifugal heat dissipation device as claimed in claim 5,wherein the heat-absorption zone is radially outward extended from onlya partial axial length of the heat-transfer zone, and defines a firsttransverse surface and an opposite second transverse surface; and thesilicon steel sheets being in contact with one of the first and thesecond transverse surface of the heat-absorption zone.
 11. The motorwith centrifugal heat dissipation device as claimed in claim 5, furthercomprising a pressure device connected to the shaft; the pressure devicebeing a pump and formed of a pressure unit, a first pipe and a secondpipe; the pressure unit having an outlet and an inlet, which areconnected to the two ends of the shaft via the first and the secondpipe, respectively.
 12. The motor with centrifugal heat dissipationdevice as claimed in claim 5, further comprising a pressure devicemounted to the hollow space of the shaft, and the pressure device beinga turbine blade assembly.
 13. The motor with centrifugal heatdissipation device as claimed in claim 5, further comprising a pressuredevice connected to one end of the shaft, and the pressure device beinga fan.
 14. A motor with centrifugal heat dissipation device, comprising:at least one shaft internally defining a hollow space and having a firstend and an opposite second end; and the first and second ends beingcommunicable with the hollow space; a centrifugal heat dissipationdevice including a main body having a shaft hole, a heat-absorptionzone, and a heat-transfer zone; the heat-transfer zone having a radiallyouter side connected to the heat-absorption zone and a radially innerside connected to the shaft hole; the shaft hole axially extendingthrough the main body, and the shaft being fitted in the shaft hole; atleast one magnetic member being externally fitted around the main bodyof the centrifugal heat dissipation device; and a housing beinginternally provided with a plurality of silicon steel sheets, which arelocated corresponding to but spaced from the magnetic member when thecentrifugal heat dissipation device and the shaft are mounted in thehousing; and the housing having at least one end being an open end, towhich a cap is connected to close the housing.
 15. The motor withcentrifugal heat dissipation device as claimed in claim 14, wherein thefirst and the second end of the shaft are connected to a first and asecond rotary oil seal, respectively.
 16. The motor with centrifugalheat dissipation device as claimed in claim 14, wherein the hollow spaceof the shaft is filled with a cooling fluid, and the cooling fluid beingselected from the group consisting of air, oil, and water.
 17. The motorwith centrifugal heat dissipation device as claimed in claim 14, whereinthe silicon steel sheets have a plurality of winding coils externallywound thereon.
 18. The motor with centrifugal heat dissipation device asclaimed in claim 14, wherein the magnetic member is a magnet.
 19. Themotor with centrifugal heat dissipation device as claimed in claim 14,wherein the heat-absorption zone is radially outward extended from onlya partial axial length of the heat-transfer zone, and defines a firsttransverse surface and an opposite second transverse surface; and themagnetic member being in contact with one of the first and the secondtransverse surface of the heat-absorption zone.
 20. The motor withcentrifugal heat dissipation device as claimed in claim 14, furthercomprising a pressure device connected to the shaft; the pressure devicebeing a pump and formed of a pressure unit, a first pipe and a secondpipe; the pressure unit having an outlet and an inlet, which areconnected to the two ends of the shaft via the first and the secondpipe, respectively.
 21. The motor with centrifugal heat dissipationdevice as claimed in claim 14, further comprising a pressure devicemounted to the hollow space of the shaft, and the pressure device beinga turbine blade assembly.
 22. The motor with centrifugal heatdissipation device as claimed in claim 14, further comprising a pressuredevice connected to one end of the shaft, and the pressure device beinga fan.